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Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with this. All I need is a formula, please. :)Thank you! Here it is:

A skier with a mass of 60.0 kg pushes off with a horizontal speed of 3.0 m/s from the top of a snow
covered hill. As he slides down the hill, his height decreases by 42 m over a distance of 100 m of travel.
How much will his kinetic energy increase by the time he reaches the bottom of the hill


    The answer is 24696 J.


    ΔKE=ΔPE=mgΔh=60•9.8•42 =24696 J

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